Battery module for starting a power equipment
AssigneeGRST International Limited
InventorsKam Piu Ho, Ranshi Wang, Peihua Shen
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Abstract
Provided herein is a battery module for starting the engines of outdoor power equipment such as automobiles, boats, trucks and tractors. The battery module disclosed herein has high performance at low temperature and has a maximum pulse discharging current measured at −30° C. of not less than 15% of the maximum pulse discharging current measured at 25° C. over a pulse discharge period of about 5 seconds. In addition, the battery module disclosed herein has a low self-discharging rate at both room temperature and high temperature. The capacity retention of the battery module is not less than 85% of its initial capacity after 7 months of room temperature storage.
Claims20
A battery module for starting engine of power equipment comprising:
- a plurality of interconnected lithium-ion battery cells;
- wherein each of the lithium-ion battery cells independently comprises a cathode, an anode, a separator interposed between the cathode and anode, and an electrolyte;
- wherein the cathode comprises a cathode current collector and a cathode electrode layer comprising a cathode material, a binder material and a conductive agent, and the anode comprises an anode current collector and an anode electrode layer comprising an anode material, a binder material and a conductive agent;
- wherein the cathode material comprises or is a core-shell composite having a core and shell structure, wherein the core comprises a lithium transition metal oxide selected from the group consisting of LiMn2O4, Li1+zNixMnyCo1−x−yO2, LiNixCoyAlzO2, and combinations thereof, wherein each x is independently from 0.3 to 0.8;
- each y is independently from 0 to 0.45;
- and each z is independently from 0 to 0.2;
- wherein the shell comprises a lithium transition metal oxide selected from the group consisting of LiCoO2, LiNiO2, LiNixMnyO2, Li1+zNixMnyCo1−x−yO2, LiNixCoyAlzO2, LiMnO2, LiMn2O4, and combinations thereof, wherein each x is independently from 0.3 to 0.8;
- each y is independently from 0.1 to 0.45;
- and each z is independently from 0 to 0.2;
- wherein the electrolyte comprises an organic solvent, a lithium salt, and an additive selected from the group consisting of diethylstilbestrol, butanesultone, vinylene carbonate, dimethyl sulfide, and combinations thereof;
- and
- wherein the amount of the additive is from 0.1% to 2% by weight, based on the total weight of the electrolyte.
Dependencies are inferred from the claim text.